we know that president obama will travel to boston tomorrow. he will speak with the victims, their family members, to that community and he has been updated regularly on the situation on the investigation, but again, there is no at this point, knowledge about whether or not these letters have any connection to what happened in boston, but obviously, this community on heightened alert as are major cities. >> as you were speaking, we were able to confirm from a federal law enforcement official that the letter addressed to president obama and the letter addressed to senator wicker are being described as quote very similar to each other. i want to bring in pete williams, who's also standing by for us in washington, d.c. and pete, i understand that there was an initial positive test, but there's really no way to know whether it's really ricin until additional testing is done. >> ever since the anthrax mailings, no mail has gone directly to the white house, capitol hill and many other government offices. it's all sent to off site facilities to test i